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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40009b4b0f1c006009457a7f0448ec95a9d6a45d732a0d526cba49d005623dba' 
  AND token = '+ZExQmZzDtPZAXzFJbPDaRTAbKNKiw/bC0fP6brrFdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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