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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ad9847625457774eaf38b8a4c38e525a373a1453f6df6a1fb6862e809e65d3' 
  AND token = 'Gna6tte9/U0ean5gbaGoebiW8tDC6viWYSJfySnI5/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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