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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8614886143fe749e53a23600fd6eb76f79353e8cf804105460aa7405ebb0b743' 
  AND token = 'ntD1FOSmHSugL6Ibw1GxG1/qlRXpu4319KrsdRF1fXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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