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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7bc3a5375e0bddb18aa1a4474d9106a880e8e7bc93ae384fe375ce82dd30319' 
  AND token = '5vVSFZViSXrD7+VlCB6RYD4bwCWqER+JWbJOU7OVGBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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