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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8430a113a50877c64772a401fb02aff3312d9a274f70c81f2c92625d904d339' 
  AND token = '+a9abImIhoXi4lOJ/6ulUfUawyFPej7Wp82MiAthZ4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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