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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c610d5b3e0773b6fd9ecfb2b6a4833b800196a73f4833548e29d7e51c57dab8b' 
  AND token = 'Ikt46Cx6BJRe7Q+qq8gExDpMt8Y9tFdnQClqXxA5410=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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