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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce5082a51ec66d7196ed33e0562efefb3386d8ae1d00f4b372236bd6675228fe' 
  AND token = 'vfDqYCNGqU4BxQ2ap7jHyHNjvS32Mzg6ubvvKjTM/Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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