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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a4ec70fb1cf4086eeb1ae7b46c3074ae7c5fedfc2ba9b86c216da2e2f65be9' 
  AND token = 'L4Ls1wg7H3L9qW7KENSKn/R9RjYixG+L+jqY3PPg2Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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