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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b932a436c966c3e5b214d3f8bb883659466ddc6f4695a1f712071647ff82acbd' 
  AND token = '1+XjdgFf8KMRgB4OLlpsr7WL2oqQ8XbX04mE1eR0ggI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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