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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c144baf773a917e89f5058b10a5c5c82aa37dbaf47ce5249a4cb5dd7f1b529d' 
  AND token = 'kv9VN4tD0/Tml6zRqzWNoUpEAtTCv+PFBlrLh1UtnRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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