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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '254aa10ae1fbb59842919d5ca5521816df0af209dba13497cfeb5fc760a933fe' 
  AND token = 'TAupehP363OCY4jI4tqlxtvcD0n2aPYfzclzSbqX5x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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