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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ea9045415edb9e3f895d155c08d89ddd8a8e3f0a1bf3cc4892f56220cb87f9' 
  AND token = 'bxN8aanEoX7CP7MEFu+j74r/M/lUUjOqd3HEf810VqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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