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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '798979e6023cf8f3b199a0cef809756883be55cb778846319cec5e988fa2d0fa' 
  AND token = 'RH34L5zNCh4oDLfwiW7oll8E/CzglS8sUlm+9gfXDzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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