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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e315dbc1ab442a6c24568313dd3f0a7f65263b09b58bf9072bac91727fc04c82' 
  AND token = 'q7KEvd44uTnlk7nfVVCi92uNag2g6P4ncKtEbXoeTp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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