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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76273086b5597905adb88deef4f55389e65099eaf1b2c33a1338f92e63c07bf2' 
  AND token = 'ffdoUL65NgJlmQqa4uaY+M2qhIj+KhctdOc+OfPRcq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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