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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d1751651122f4e15061391c8311624e7a21809d2e4b10064880eb697792b43' 
  AND token = 'emVuHTkMOy2fmAJd7KhOhgKkv+7CB3R7Sx297qn8qaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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