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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e58bc9914efe0dc36e9d174d863e10dcc8e4761037c4bdca0feefd44b512c23b' 
  AND token = 'U/KN/7QweqlbvwadM4BRiERXyBLG6rHMBey7xSWUrAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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