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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '000c403e84110d1211be4ef80f74e65efb267f6d9e5804826352405d0bcf6d67' 
  AND token = 'ZDT3adeSYMkwAHeOhonc7iFe943VRBRKuRdepxeHKU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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