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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2f7da02e9479e7ed08742aa4d07a0e4b0f30de6edfe9cb050c677a2500424df' 
  AND token = 'zGSRixMLiIcK4abjgNB27gOvc7Wu1AZGu8vyyqw7w8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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