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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bcdfc69bd50bbe491b4bbc8f1eadd19912433195c490d9af2ae2de8dc3c38c' 
  AND token = 'vqpeK4iifARlDRKaYbwyBp1//urivpI+QLaBy+9Htk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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