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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd139d3fcfe297b5bfd6c74ee5ac66d5ef1393e883dcc43a10ea8b66d31937e70' 
  AND token = 'j3Jtd+6Fr26asx32ufPHP1kf3kvMM4Ie5ytzpXDJOqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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