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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4f939bbe0594b8a007f43f33809540c6cd2adc2841c69f4c89d5d4ed1e1b16' 
  AND token = 'Yd3CKFpMoac1n0nNWvEvaAY+HlyFcu+tiB5sSeA9Ld4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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