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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9819919d8443811cb4c1eaeb998076f679dfeea5237b7040df6a44f06b8c30d9' 
  AND token = '4LZb8nEFkfI7hXVnfeNyRR3OmSeKkaobEUwcutIV3ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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