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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebc12d513516390bd459cd80778096de8d7621c5e37469e9789ff8e07e706da' 
  AND token = 'AG6p462no+0Cdoiy6BU1Ih2VVlNDLDFHQ3M6pulOCak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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