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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8d5624b827cb25c0ab048af94ba617dbd270f8ee1b4b1f1447ca84802f25cab' 
  AND token = 'ej/URatE4QAGSlaXw4juGh8Ipm3m8sPh5fMIAfF1i+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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