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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdce7197be81648a2cacaf13966ea720e0991c18d20d37aec2bb86f3c387ce33' 
  AND token = 'sRVzwYB2fqJDFee0o+P86CNsPmdgDniOLJ+MkwxDxgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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