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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93965be51b6b92b240c23bd6f443b1ff71462fb56d9a30685f8ca2e281e54aae' 
  AND token = 'jrrKrCvfFAZeWMLU03t0Kx6CHnUjGOUb7hH1iycWUv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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