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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab8e03e6f65e225174a32dda0a9be42edba943b75989c47200cb5b521a58e0e' 
  AND token = 'GejAbmiXYeiJTUlNRVJvZaTWGTHN4t9izEWzdgIItos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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