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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacd1de2e8c8eb01dc1438ef72a697cc3f7cd68fe5318dd25cf9ba296b72034b' 
  AND token = 'RORL33EN9WY5LyXujsvqY57NnIiuEw6D18FlOMquXkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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