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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e754e36b13bbddce3c2d64b989d858a978dc7f321f0af56e9a62c6a6bf43bbe' 
  AND token = 'jXvzHBEK3CAlAh9XmzJuc3zh+cAvUnjamxK9pjEc4TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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