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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09f54161dea9b0326babd6f5e7ac0383b6fbba79c6abe5bb7aa4ad722e0abeb5' 
  AND token = 'QaIEMLshUPRmkLb9F39lIWOaqpqXwlxcU1kgCiapBKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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