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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e510295ff21d9e450152555e22b263a76e7d82ad9fb0d83c659581344ed64757' 
  AND token = 'xZG5t4lDcL6ucZyxGym/agydc7YH1xyMfF1m97yN6SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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