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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33267797bed65f8cee05dfffcc8b54c6f75d8f8d29b284acd728a58002862238' 
  AND token = 'qIG5R9g8H8ftOENZ93R7+Bk2jCiGbUYaleGIZErUUOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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