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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03c97683ae343b1bc38f6da4de75602be763ad00d743d5ce0d26e91afc7d8795' 
  AND token = 'n4HlMf1AQB5wZKao7umTA3FFx7/5OfNGqS3CFR3nXoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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