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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '880d272fc4c8cd4158ea56fbd6c26e0dfeea545f6a7674ae604a4c5f860eb01b' 
  AND token = 'UIMdDa0aphE0f84XnGQR6yINdHNqGpnTfq1SpVR45nA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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