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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '036eb87066da0e20b1c47a064b4bf3e8ce6a7dc5e85513c588fce4236b6945d7' 
  AND token = 'jESwyTS1/doscmn5Jo0KUZ4wgcz6JMpukU75NbB6hac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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