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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdb624dfe3f52bc22d2b2732282a2c484150e8d89e08ac8c535bbd7a700df53e' 
  AND token = 'CB7U1jFnLFYkIs29ZwiTi1J8a/pGnzxHmQfjqmwWnIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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