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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb890f503cea2e890686737d1b9ab9d61673c07225e999dda09f0adac7e0af33' 
  AND token = 'csYSfVXA8kNLYfiyiBPJJC3oeacxvRFlch61jrDgLzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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