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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e01a3a74a2e432307367a0f134bad8568d415895b326b214b29c6255140a884' 
  AND token = 'pdyZzd6ss6QdhtbNOh7njwubcn0Nm9E21s+Hg22vmwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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