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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67242e757d157c2197fd2584f87ef5901e24a607918042b5e694d3d5ed3a1ccd' 
  AND token = 'h8kCBy17tGFDYqzVTV11cCF8aGowWqkecon2qGlv0uI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}