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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c19d7cff1ba0eecb4b48358afcb00f31f90cd08dc057bcfd15386c4697802a6' 
  AND token = 'C6vIIDatZpta6BNDaFBcB1PQ7pogAufax/C6y6wgjuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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