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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441897886a7552630153e1006cabf9aa6f0d35948f194a41dc3c2de72d317e1f' 
  AND token = '9Am2Ecdrco94oYBpuHm+YkwVC5BIfQ+RcyfiezfqsBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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