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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d184df62963ed4791c8679b433d40df3fcd61439aee8d338365d9d745df8c2f' 
  AND token = 'XMCPU+xhYk9xff0gknEi0H+LieyQznjE8HU9rRgQdlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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