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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1fae84566484e73ddbe4ad866770530f3b3d5fce851ddb7a4974397123441f4' 
  AND token = 'p/12KNT2KI2JJvKdFPYaQeLpmJULL8hwwOB7bZ7nxn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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