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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79149321d2338e8e0898ddfecccede5a42a8f8c196ab9250f4c9e56439f0e66f' 
  AND token = 'HX4uTE7XEaiiPx6CvLfIGpkcq0es2GeYBSIXrwEAZ3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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