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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04d936b70484bf61ee05798721333627baffd24cc09e0dc691e66a22d548e9ab' 
  AND token = 'nAstcY8cvzm/HW+RGxhWpLScdTfNoxp5NOtn7GTe9JU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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