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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '414df5b9a1434459b52e0f648192404929b7ccba74c2a0147c5156c8cf6ce3e1' 
  AND token = 'RvJ7ce20zQOUGXnCQAgJS3UIDNJzwII0Ck/SWwfh51g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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