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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf27e9a7d9c064611a45a29b5062ad555c5679303ed6744c3e1945bf6eb39e4a' 
  AND token = '/1zqsyrYRmm2T9JRkqrEzMu+Bn2NkwN9TBWtDSrFBu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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