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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a2c4b9f6808533c44e8790a38fccec3129f4c858422e5ce5bb894ad8c9e3e0c' 
  AND token = 'VCGkUXoUtuuR3pW3YQroOjNVnsgb4UtXh7I8rYaejLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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