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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d187944a88403e4ef4cdf44803e40701b04d459ffac05e7696ffe51c286cb0a' 
  AND token = 'DQAcgWikouQQsto6ud1C0TOXULwY2hvgrsKibv/3mI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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