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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f13e59571d25423d3fb07e132ab9a67f660ae9205017aef09ffef8ead80afa2c' 
  AND token = 'StFjVqubq6RLt2kRRz7KXFmpA7MIg0IssKooyNDkCj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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