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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dafbd2a0f10636b89f20f1f38cb52fd3b517d71b0fd1c27756f33a5be00054b8' 
  AND token = 'PwaLwLPIwXHiCw2XOajJBwz68BU4bPZI4kw/902VhMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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