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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739fc275b514d3635c810c0a90f59897c3a972058413a4d88b473b29780932a2' 
  AND token = 'Kogz8vjoNF6ndLrt01rL+5nFaUb1apCg5BkafVPmvE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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