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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31f72e07cdf65b49560b497baa64e67963dce3a1b5f880fa649ec9e6d53266ad' 
  AND token = 'M7DmTCtQC6SEyTkVcjmVr+f+rnFu1q4pQiYJuOpaiNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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